Chapter 9 Flashcards
Point
An exact location in space
Ray
Part of a line that continues without end in one direction and the other one has an endpoint
Line
A straight path continuing without end in two opposite directions
Line segment
A part of a line with two endpoints
Vertex
Point where two rays meet to from an angle
Degrees
A unit of angle measure. The symbol is °
Protractor
Instrument used for measuring angles
Acute angle
An angle that is less than 90°
Obtuse angle
An angle that is more then 90°
Right angle
An angle with a measure of exactly 90°
Straight angle
An angle with the measure of exactly 180°
Turn
1/4,1/2,3/4, or a full turn which correspond to angles that are 90,180,270,and 360°
Inner scale
Inner set of numbers on a protractor
Outer scale
Outer set of numbers on a protractor
